I don't know much about Valve but I can assure you that gaming and Chess are in bed together. 
Who here has Steam (Valve)??
I use a 360 to play games, because my computer stinks; but I have all of the games that you mentioned, besides Counter Strike but I don't think that is on the 360.
@shadowslayer I play on PC and not on Xbox 360 or PS3 so yeah :) I got Valves Complete pack and a few other good games :D
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I am just interested to know if Gaming and Chess Mix! So I am asking people who play games such as Counter Strike, Team Fortress 2, Left 4 Dead, Half Life 2 etc games made by valve, please comment below. :)